package com.blog.util;
import java.io.UnsupportedEncodingException;  
import java.net.URLDecoder;  
import java.net.URLEncoder;  
  
import org.apache.commons.codec.DecoderException;  
import org.apache.commons.codec.binary.Base64;  
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;  
  
/** 
 * 各种格式的编码加码工具类. 
 *  
 * 集成Commons-Codec,Commons-Lang及JDK提供的编解码方法. 
 *  
 *   
 */  
public class EncodeUtils {  
  
    private static final String DEFAULT_URL_ENCODING = "UTF-8";  
  
    /** 
     * Hex编码. 
     */  
    /*public static String hexEncode(byte[] input) { 
        return Hex.encodeHexString(input); 
    }*/  
  
    /** 
     * Hex解码. 
     */  
    public static byte[] hexDecode(String input) {  
        try {  
            return Hex.decodeHex(input.toCharArray());  
        } catch (DecoderException e) {  
            throw new IllegalStateException("Hex Decoder exception", e);  
        }  
    }  
  
    /** 
     * Base64编码. 
     */  
    public static String base64Encode(byte[] input) {  
        return new String(Base64.encodeBase64(input));  
    }  
  
    /** 
     * Base64编码, URL安全(将Base64中的URL非法字符�?,/=转为其他字符, 见RFC3548). 
     */  
    public static String base64UrlSafeEncode(byte[] input) {  
        return Base64.encodeBase64URLSafeString(input);  
    }  
  
    /** 
     * Base64解码. 
     */  
    public static byte[] base64Decode(String input) {  
        return Base64.decodeBase64(input);  
    }  
  
    /** 
     * URL 编码, Encode默认为UTF-8.  
     */  
    public static String urlEncode(String input) {  
        try {  
            return URLEncoder.encode(input, DEFAULT_URL_ENCODING);  
        } catch (UnsupportedEncodingException e) {  
            throw new IllegalArgumentException("Unsupported Encoding Exception", e);  
        }  
    }  
  
    /** 
     * URL 解码, Encode默认为UTF-8.  
     */  
    public static String urlDecode(String input) {  
        try {  
            return URLDecoder.decode(input, DEFAULT_URL_ENCODING);  
        } catch (UnsupportedEncodingException e) {  
            throw new IllegalArgumentException("Unsupported Encoding Exception", e);  
        }  
    }  
  
    /** 
     * Html 转码. 
     */  
    public static String htmlEscape(String html) {  
        return StringEscapeUtils.escapeHtml3(html);  
    }  
  
    /** 
     * Html 解码. 
     */  
    public static String htmlUnescape(String htmlEscaped) {  
        return StringEscapeUtils.unescapeHtml3(htmlEscaped);  
    }  
  
    /** 
     * Xml 转码. 
     */  
    public static String xmlEscape(String xml) {  
        return StringEscapeUtils.escapeXml(xml);  
    }  
  
    /** 
     * Xml 解码. 
     */  
    public static String xmlUnescape(String xmlEscaped) {  
        return StringEscapeUtils.unescapeXml(xmlEscaped);  
    }  
}  